兰旭，主动投案！

Group 1 - The former executive vice president of Yunnan Tin Company, Lan Xu, is under investigation for serious violations of discipline and law, having voluntarily surrendered to authorities [2] - The investigation is being conducted by the Yunnan Provincial Commission for Discipline Inspection and Supervision [2] Group 2 - The news was reported by the Central Commission for Discipline Inspection and the National Supervisory Commission [3] - The information was published by China Energy News, edited by Zhao Fangting [3]